Enhanced hollow foam tire structure

ABSTRACT

This invention discloses a hollow EVA foam tire structure capable of carrying heavy loads, particularly a hollow EVA form tire having an accommodating space between the inboard sides of the tire. The tire is comprised of a plurality of sections substantially arranged into an annular shape, and a wheel core being hollow on both sides, such that a plurality of protruded block sections is disposed on the internal side of the flange section extended from the accommodating space and both sides of the tire are covered by a rim having two corresponding external flange surfaces at the external sides, and a pointed splinter is disposed on the internal side of the external flange surface and a protruded block section is protruded from the surrounding surface of the flange end at the internal side of the rim, so that the protruded block sections of the wheel core are alternatively and mutually engaged. Therefore, when the two corresponding rims are securely coupled, the pointed splinters of the rim can be pierced and fixed into the tire, and the internal side of the tire is embedded into the hollow section of the wheel core by the compressed force. Therefore, the tire, the wheel core and the two side rims can be coupled more securely so as to enhance the carrying capacity of the tire by the wheel core.

FIELD OF THE INVENTION

The present invention relates to hollow ethylene-vinyl acetate (EVA) foam tires having an enhanced wheel core and a rim for being clamped on both sides, such that the three parts can be connected more securely as to enhance the loading capacity of the tire.

BACKGROUND OF THE INVENTION

In general, a solid tire made of ethylene-vinyl acetate (EVA) foam material is commonly used for vehicles carrying less load and having no absorber but demanding a good shockproof function, because such tire has the features of low cost, easy manufacturing and outstanding elasticity. Although the tire of this kind is solid, the carrying capacity is still insufficient due to its manufacturing material. However, the U.S. Pat. No. 4,216,810 disclosed a tire structure which comprises a plurality of annularly disposed circular protector elements keeping an appropriate distance from the inner wall of the wire and a flange being accommodated precisely between both inboard sides of the tire. When the inboard rim and the outboard rim are engaged, the corresponding flanges of the two rims are clamped, and thus the protector elements can be mounted into the tire. However, the main purpose of the protector element is to support a vehicle by the protector elements in a tire particularly when the tire is punctured, such that when the flat tire is pressed and in contact with the ground, the tire and the rim will not be in direct contact, and the vehicle can continue its traveling without damaging the tire and the rim. Such arrangement allows a flat tire to travel more stably without skids.

Although a pneumatic tire with this structure has better elasticity and cushioning effect, its carrying capacity is still very limited. Furthermore, the pneumatic tire also has the risk of being punctured and flatted.

SUMMARY OF THE INVENTION

It is therefore a primary objective of the present invention to overcome the condition of maintaining a good elastic and loading capability of a tire without air inflation. The tire according to the present invention is made of EVA materials and substantially hollow, and the tire comprises a wheel core in an annular shape formed by a plurality of separated sections and a rim clamped on both sides of the tire. In addition to strengthening the structure of the EVA tire, the present invention also enhances its loading capacity and also maintains an excellent elasticity.

Further, a protruded section disposed on the two corresponding inboard sides of the foregoing rim and the sides of the wheel core are substantially hollow, such that the tire can engage the rim and wheel cores better as to further prevent the EVA foam tire from skidding.

The technical measures adopted by the invention to achieve the foregoing objectives, the hollow foam tire installs a hollow wheel core on the side of the tire in advance, and the wheel core is comprised of a plurality of circular sections and both sides of the tire are clamped by the rim and a pointed splinter disposed on the surface where the rim and tire are in contact with each other is pierced into the tire, and a protruded block section for corresponding and engaging with each other is disposed on the internal surface of the wheel core and the surface corresponding to the flange section of the two rims.

The invention can be fully understood by the following description accompanied with the drawings of a preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a first preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view of a first preferred embodiment of the present invention.

FIG. 3 is an exploded view of a second preferred embodiment of the present invention.

FIG. 4 is a cross-sectional view of a second preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 1 and 2 for the present invention. In the figures, a wheel rim 2 of the foam tire comprises a plurality of spokes 23 connected between a hub 21 and a rim 22, a plurality of pointed splinters 222 evenly disposed on the concave surface of the rim 22 and a wheel core 3 formed by a plurality of separated sections 3 a, 3 b, 3 c, 3 d. A hollow section 31 is alternatively disposed on both sides of each separated section 3 a, 3 b, 3 c, 3 d, and each separated section 3 a, 3 b, 3 c, 3 d is pre-installed into a hollow foam tire 4. The tire 4 together with the wheel core 3 are sheathed onto the rim 22 of the wheel rim 2 as to pierce each pointed splinter 222 into the tire 4 and fix the tire 4 into place, and thus prevent skids between the wheel rim 2 and the tire 4. Furthermore, the hollow tire 4 wraps the wheel core 3, and thus the foam tire can carry heavier loads.

Please refer to FIGS. 3 and 4 for another preferred embodiment of the present invention. The wheel rim 5 of the foam tire is comprised of two corresponding rims 5 engaged with each other by screws, and a wheel core 3 is comprised of a plurality of separated sections 3 a, 3 b, 3 c, 3 d disposed between the two rims 5 and aligned in a circular shape, and a tire 4 is clamped and fixed between the two rims 5 and the wheel core 3, wherein:

A tire 4, substantially has a design in a hollow shape with two corresponding internal flange sections 41 disposed on the internal sides of the tire 4 and an accommodating space 42 defined between two internal flange sections 41.

A wheel core 3 comprises a plurality of separated sections 3 a, 3 b, 3 c, 3 d aligned in a circular shape, a hollow section 31 disposed on the intervals between separated sections 3 a, 3 b, 3 c, 3 d, a wider flange section 32 disposed on the internal side on both sides of each separated section 3 a, 3 b, 3 c, 3 d, and a plurality of protruded block sections 33 disposed at intervals on the internal surface of the flange section 32.

Two corresponding wheel rims 5 are installed on both sides of the tire 4. Besides having an axle hole (not labeled in the figure) for passing a wheel axle through, the external side also has a convexly curved flange surface 51 and a plurality of pointed splinters 52 disposed on the flange surface 51, a flange end 53 disposed on the internal sides of the rim 5 and a plurality of protruded block sections 54 disposed at intervals on the external surrounding surface of the flange end 53.

The wheel core 3 comprised of separated sections 3 a, 3 b, 3 c, 3 d is preinstalled into the hollow tire 4, and the two corresponding rims 5 are installed onto both internal sides of the tire 4 and the two corresponding rims 5 are coupled together by screws, so that the flange ends 53 of the two rims 5 are extended into the foam tire 4 and the external flange surface 51 of the rim 5 is attached onto the external side of the internal flange section 41 of the foam tire 4. The accommodating space 42 disposed between two internal flange sections 41 of the foam tire 4 precisely locates the lower neck section of every separated section 3 a, 3 b, 3 c, 3 d of the wheel core 3. In the meantime, the flange section 32 of each separated section 3 a, 3 b, 3 c, 3 d is extended onto the flange end 53 of the rim 5, so that the corresponding protruded block sections 33, 54 between the two are engaged alternately. Therefore, the two corresponding rims 5 secured by screws are moved inwardly as to clamp the internal flange section 41 of the foam tire 4 between the external flange surface 51 of the rim 5 and the wheel core 3. In the meantime, each pointed splinter 52 of the external flange surface 51 of the rim 5 will pierce into the foam tire 4, and the internal flange section 41 of the foam tire 4 will be embedded into the hollow hole 31 on the side of each separated section 3 a, 3 b, 3 c, 3 d at the contact position of the internal flange section 41 of the foam tire 4 and the side of each separated section 3 a, 3 b, 3 c, 3 d when the flange section 41 is pressed. Therefore, the foam tire 4 is clamped and fixed, and also positioned by the engaging the pointed splinters 52 and the hollow holes 31, so that the foam tire 4, the rim 5, and each separated section 3 a, 3 b, 3 c, 3 d (or the wheel core 3) will not have any skid at all. In the mean time, since the protruded block sections 54 on the surface of the flange ends 53 of the rim 5 and the protruded block sections 33 on the internal sides of each separated section 3 a, 3 b, 3 c, 3 d are coupled alternately for the positioning effect, therefore there is a slippery-proof effect between the rim 5 and the wheel core 3. Thus, the design according to the present invention separates the wheel core 3 from the rim 5 instead of directly forming the wheel core 3 onto the rim 5, which saves the cost of the molding and the trouble of the operation, and also allows users to freely assemble or remove the rim 5, the tire 4 or the wheel core 3, which provides a more flexible way of installing or removing any parts for the maintenance.

While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures. 

1. An enhanced hollow foam tire structure, comprising: a wheel rim, having a plurality of pointed splinters being evenly disposed on a concave surface and in contact with a tire; a wheel core, being comprised of a plurality of separated sections aligned in a circular shape, and an external top surface of said wheel core pressing against an internal wall of said tire having a hollow section on its side; thereby said pointed splinters disposed on the inner side of said wheel rim piercing into said tire and said tire being embedded into said hollow section of said wheel core as for preventing said tire from skidding and enhancing the carrying capacity of said tire.
 2. The enhanced hollow foam tire structure of claim 1, wherein said wheel rim is comprised of two corresponding half rims engaged with each other; said wheel rim comprises a protruded block side disposed on the internal side of said tire for retaining said wheel rim; said wheel core comprised of said separated sections is preinstalled in said tire; a wider flange section is extended from the bottom of each said separated section out of said tire; and a protruded block section is protruded from the internal side of said flange section, such that said wheel rim and said protruded block section are engaged alternately with each other at the contact surface between said wheel rim and each said separated section. 